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Commit 9674cdc7 authored by Maxim Kuvyrkov's avatar Maxim Kuvyrkov Committed by Geert Uytterhoeven
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m68k: Add NPTL support 



This patch adds several syscalls, that provide necessary
functionality to support NPTL on m68k/ColdFire.
The syscalls are get_thread_area, set_thread_area, atomic_cmpxchg_32 and
atomic_barrier.
The cmpxchg syscall is required for ColdFire as it doesn't support 'cas'
instruction.

Also a ptrace call PTRACE_GET_THREAD_AREA is added to allow debugger to
inspect the TLS storage.

Signed-off-by: default avatarMaxim Kuvyrkov <maxim@codesourcery.com>
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
parent f54bcdc2

arch/m68k/include/asm/ptrace.h

+2 −0
Original line number Diff line number Diff line
@@ -71,6 +71,8 @@ struct switch_stack { 
#define PTRACE_GETFPREGS          14

#define PTRACE_SETFPREGS          15



#define PTRACE_GET_THREAD_AREA    25



#define PTRACE_SINGLEBLOCK	33	/* resume execution until next branch */



#ifdef __KERNEL__

arch/m68k/include/asm/thread_info_mm.h

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ struct thread_info { 
	struct exec_domain	*exec_domain;	/* execution domain */

	int			preempt_count;	/* 0 => preemptable, <0 => BUG */

	__u32 cpu; /* should always be 0 on m68k */

	unsigned long		tp_value;	/* thread pointer */

	struct restart_block    restart_block;

};

#endif /* __ASSEMBLY__ */

arch/m68k/include/asm/unistd.h

+5 −1
Original line number Diff line number Diff line
@@ -336,10 +336,14 @@ 
#define __NR_pwritev		330

#define __NR_rt_tgsigqueueinfo	331

#define __NR_perf_event_open	332

#define __NR_get_thread_area	333

#define __NR_set_thread_area	334

#define __NR_atomic_cmpxchg_32	335

#define __NR_atomic_barrier	336



#ifdef __KERNEL__



#define NR_syscalls		333

#define NR_syscalls		337



#define __ARCH_WANT_IPC_PARSE_VERSION

#define __ARCH_WANT_OLD_READDIR

arch/m68k/kernel/entry.S

+4 −0
Original line number Diff line number Diff line
@@ -761,4 +761,8 @@ sys_call_table: 
	.long sys_pwritev		/* 330 */

	.long sys_rt_tgsigqueueinfo

	.long sys_perf_event_open

	.long sys_get_thread_area

	.long sys_set_thread_area

	.long sys_atomic_cmpxchg_32	/* 335 */

	.long sys_atomic_barrier

arch/m68k/kernel/process.c

+4 −0
Original line number Diff line number Diff line
@@ -251,6 +251,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, 


	p->thread.usp = usp;

	p->thread.ksp = (unsigned long)childstack;



	if (clone_flags & CLONE_SETTLS)

		task_thread_info(p)->tp_value = regs->d5;



	/*

	 * Must save the current SFC/DFC value, NOT the value when

	 * the parent was last descheduled - RGH  10-08-96